In 2001, a randomized, accelerated, longitudinal study conducted in Manitoba showed the beneficial effects of the program were mostly maintained or continued to improve throughout the follow-up years (physical aggression decreased, indirect aggression decreased, and pro-social behaviors increased).
A longitudinal cluster randomized controlled trial conducted in Northern Ireland found that Roots of Empathy had a positive impact in increasing children’s prosocial behaviour and reducing their aggressive anddifficult behaviour. The study also showed some evidence that the effects in relation to reducing difficult behaviour may have been sustained for three years beyond program participation. The program was also found to be cost-effective in line with national guidelines.
An evaluation of the Roots of Empathy program in Switzerland, 2015-2017, showed a significant decrease in aggression compared with controls. Results were maintained one year after program completion.